JP5682600B2 - Rotating electrical machine rotor - Google Patents

Description

  The present invention relates to a rotor of a rotating electrical machine, and more particularly to a rotor of a rotating electrical machine provided with a rotor coil.

  There is a type of rotating electrical machine that uses a rotor provided with a rotor coil. For example, in Patent Document 1, as a rotating electrical machine, a rotating magnetic field is formed by flowing an alternating current through a stator coil, and an induction current is generated in the rotor coil by interlinking the spatial harmonic component of the rotating magnetic field with the rotor coil. It is stated that Here, the rotor coil is wound around each salient pole of the rotor, and each rotor coil is short-circuited via a diode to rectify the induced current, thereby changing the magnetization direction in which each salient pole of the rotor is fixed. Works as a magnet with. Accordingly, it is stated that the torque due to the spatial harmonic component can be used in addition to the torque due to the fundamental wave component of the rotating magnetic field.

JP 2009-112091 A

  In the rotating electrical machine described in Patent Document 1, centrifugal force acts on the rotor coil wound around the rotor salient pole when the rotor rotates. Therefore, it is preferable to provide a holding member for preventing the rotor coil from projecting radially outward from the rotor salient pole by such centrifugal force. In this case, it is desired that the holding member be devised so as not to compress the winding space of the rotor coil wound around the rotor salient pole while ensuring the strength to hold the rotor coil against the centrifugal force. .

  An object of the present invention is to provide a rotor of a rotating electrical machine that can secure a coil winding space between rotor salient poles without pressing while holding a rotor coil wound around the rotor salient poles. .

A rotor of a rotating electrical machine according to the present invention includes a rotor core having a plurality of rotor salient poles arranged along an outer circumferential direction, a rotor coil wound around the rotor salient poles, and a slot between the rotor salient poles. Holding member provided so as to be closed, and the holding member extends in the radial direction between the rotor coils wound around two circumferentially adjacent rotor salient poles, and the radially inner end portion is A leg portion fixed to the rotor core and a beam portion extending from the radially outer end portion of the leg portion to both sides in the circumferential direction and closing the radially outer side of the slot are integrally formed, and the leg portion of the holding member It does not include the coolant passage and in which the convex portion in contact with the coil conductor constituting the rotor coil is formed to protrude in the circumferential direction.

  In the rotor of the rotating electrical machine according to the present invention, a plurality of convex portions of the holding member may be formed on both circumferential surfaces of the leg portion with a radial interval.

  Moreover, the rotor of the rotary electric machine which concerns on this invention WHEREIN: The circumferential direction front-end | tip part of the beam part of the said holding member may be latched by the outer peripheral end part of the said rotor salient pole.

  Furthermore, in the rotor of the rotating electrical machine according to the present invention, the rotor coil is wound around the tip side of each rotor salient pole, and an induction current is generated by interlinking of the magnetic flux of the rotating magnetic field by the stator. A coil, a rectifying unit connected to the induction coil and rectifying the flow direction of the induction current, and wound around a root side of each rotor salient pole, connected to the induction coil, and generated in the induction coil You may provide the common coil which magnetizes each said rotor salient pole to a different polarity alternately by the induced current in the circumferential direction.

  In this case, a magnetic member may be provided in the leg portion of the holding member positioned between the induction coils on both sides in the circumferential direction in the slot.

  According to the rotor of the rotating electrical machine of the present invention, the coil conductor of the rotor coil to which the centrifugal force acts during the rotation of the rotor is engaged with the convex portion so that a part of the centrifugal force is received by the leg portion of the holding member. Can do. Therefore, the thickness of the base portion between the leg portion and the beam portion can be reduced as compared with the case where the rotor coil is held against the centrifugal force only by the beam portion. Thereby, the coil winding space between salient pole parts can be ensured widely without pressing.

It is a schematic sectional drawing which shows a part of circumferential direction of the rotary electric machine containing the rotor which is embodiment of this invention. It is a figure which expands and shows the rotor of FIG. It is a figure which expands and shows the A section in FIG. In the rotary electric machine of FIG. 2, it is a schematic diagram which shows a mode that the magnetic flux produced | generated by the induced current which flows into a rotor coil flows in a rotor. FIG. 5 is a circuit mounting diagram corresponding to FIG. 4, in which a diode is connected to the rotor coil. FIG. 2 is a diagram showing an equivalent circuit of a connection circuit of a pair of rotor coils wound around two rotor salient poles adjacent to each other in the circumferential direction of the rotor in the rotating electric machine of FIG. 1. It is a figure corresponding to FIG. 2 which shows the comparative example by which the convex part is not formed in the leg part of a holding member. It is a figure corresponding to FIG. 2 which shows the example in which the convex part formed in the leg part of a holding member was formed in triangle shape. It is a figure which expands and shows the B section in FIG. It is a figure corresponding to FIG. 2 which shows another example in which the convex part formed in the leg part of a holding member was formed in triangle shape.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to the application, purpose, specification, and the like. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that these characteristic portions are used in appropriate combinations.

  1-6 is a figure which shows the rotary electric machine 10 containing the rotor which is one Embodiment of this invention. FIG. 1 is a schematic cross-sectional view showing a part in the circumferential direction of the stator 12 and the rotor 14 of the rotating electrical machine 10. As shown in FIG. 1, the rotating electrical machine 10 functions as an electric motor or a generator, and is arranged to face a stator 12 fixed to a casing (not shown) and radially inward with a predetermined gap from the stator 12. And a rotor 14 rotatable with respect to the stator 12. The “radial direction” refers to a radial direction orthogonal to the rotation center axis of the rotor 14 unless otherwise specified. The “circumferential direction” refers to a direction along a circle drawn around the rotation center axis of the rotor 14 unless otherwise specified. The “axial direction” refers to the axial direction of the rotor 14 unless otherwise specified.

  The stator 12 includes a stator core 16. The stator core 16 is formed of a magnetic material such as a laminated body of metal plates such as silicon steel plates or a dust core. A plurality of teeth 18 projecting radially inward toward the rotor 14 are formed at a plurality of circumferential positions on the inner circumferential surface of the stator core 16 at intervals in the circumferential direction. A slot 19 is formed between each tooth 18.

  The stator core 16 is wound with stator coils 20u, 20v, and 20w of a plurality of phases (for example, U-phase, V-phase, and W-phase). The stator coils 20 u, 20 v, and 20 w of each phase are wound in concentrated winding around the teeth 18 of the stator core 16 through the slots 19. In this case, one pole pair is constituted by three teeth 18 each wound with three-phase (U-phase, V-phase, W-phase) stator coils 20u, 20v, 20w. Then, by passing, for example, a three-phase alternating current through the plurality of stator coils 20u, 20v, 20w, each tooth 18 is magnetized and a rotating magnetic field rotating in the circumferential direction can be generated in the stator 12.

  The rotor 14 includes a substantially cylindrical rotor core 24 formed of a magnetic material such as a laminate of a plurality of magnetic steel plates or a dust core. Two end plates (not shown) can be installed on both sides of the rotor core 24 in the axial direction. A shaft hole 26 is formed in the central portion of the rotor core 24 so as to extend in the axial direction. A shaft (not shown) is inserted into the shaft hole 26 and fixed. The shaft fixed in this way is rotatably supported by a bearing member in a casing or the like. Thereby, the rotor 14 is provided to be rotatable with respect to the stator 12.

  FIG. 2 is an enlarged view showing a part of the rotor 14 of FIG. FIG. 3 is a diagram further enlarging the portion A in FIG. The rotor core 24 has a plurality of rotor salient poles 32n and 32s. Each of the rotor salient poles 32n and 32s protrudes outward in the radial direction and is formed at intervals in the circumferential direction. Here, the rotor salient pole 32n is an N pole forming salient pole magnetized to the N pole by the rotor coil as will be described later. The rotor salient pole 32s is an S pole forming salient pole that is magnetized to the S pole by a rotor coil described later. The rotor salient poles 32n and the rotor salient poles 32s are alternately arranged in the circumferential direction. A slot 34 is formed between the rotor salient poles 32n and 32s. The slot 34 has a substantially trapezoidal axial cross section.

  Four types of rotor coils 28n, 28s, 30n, 30s are wound around two rotor salient poles 32n, 32s adjacent in the circumferential direction. The rotor coil 28n is an N-pole induction coil wound in concentrated winding around the radially outer tip side of the rotor salient pole 32n. The rotor coil 28s is an S-pole induction coil that is wound by concentrated winding on the radially outer tip side of the rotor salient pole 32s. The rotor coil 30n is an N-pole common coil wound by concentrated winding on the radially inner base side of the rotor salient pole 32n. The rotor coil 30s is an S-pole common coil wound around the radially inner base side of the rotor salient pole 32s. These rotor coils 28n, 28s, 30n and 30s are accommodated in a slot 34 formed between the rotor salient poles 32n and 32s. Further, the rotor coils 28n, 28s, 30n, and 30s are connected to each other via a diode that is a rectifying unit described later.

  An insulator 35 is interposed between the rotor salient poles 32n, 32s and the rotor coils 28n, 28s, 30n, 30s. Thereby, electrical insulation between the rotor core 24 and the rotor coils 28n, 28s, 30n, 30s is ensured. Further, the insulator 35 has a portion extending between the rotor coils 28n and 28s and the rotor coils 30n and 30s, whereby electric insulation between the two types of rotor coils 28n and 28s and 30n and 30s is achieved. Sexual enhancement is planned.

  The rotor 14 in this embodiment further includes a holding member 50. The holding member 50 has a function of closing the radially outer opening of the slot 34 in the rotor 14 and holding the state where the rotor coil is wound around the rotor core 24. The holding member 50 is preferably made of a nonmagnetic material such as resin. Accordingly, since the holding member 50 is not magnetically coupled to the rotor core 24, there is an advantage that it is possible to prevent an adverse effect on the flow of magnetic flux in the rotor core 24.

  As shown in FIG. 2, the holding member 50 has a substantially T-shaped cross-sectional shape and a length that substantially corresponds to the entire axial length of the rotor core 24. The holding member 50 integrally includes a leg portion 52 extending in the radial direction and a pair of beam portions 54 extending from the radially outer end of the leg portion 52 to both sides in the circumferential direction.

  A radially inner end 52 a of the leg 52 of the holding member 50 is fixed to a rotor yoke 34 a corresponding to the slot bottom of the rotor core 24. More specifically, the end portion 52a of the leg portion 52 is bulged and formed so as to have a wider width in the circumferential direction than a portion 52b of the leg portion 52 located in the slot 34 (hereinafter referred to as the slot inner portion). Yes. A locking groove 27 having a shape corresponding to the end portion 52a is formed in the rotor yoke 34a of the rotor core 24 so as to extend in the axial direction. Since the locking groove 27 opens at the axial end portion of the rotor core 24, the end portion 52 a of the leg portion 52 can be locked to the locking groove 27 by inserting the holding member 50 through the opening portion. . Thereby, the leg portion 52 of the holding member 50 is fitted and fixed to the locking groove 27. As the leg portion 52 of the holding member 50 is fixed to the rotor core 24 in this way, the movement of the holding member 50 to the outside in the radial direction is restricted. As a result, the centrifugal force acting on the rotor coil when the rotor 14 rotates is reduced. It becomes possible to exert a holding force to resist.

  Further, the in-slot portion 52b of the leg portion 52 of the holding member 50 is formed as a plate-like portion extending along the radial direction between the rotor coils 28n, 30n and the rotor coils 28s, 30s located on both sides in the circumferential direction. Has been. A plurality of convex portions 56 are formed on the surfaces on both sides in the circumferential direction of the slot inner portion 52b of the leg portion 52 at intervals in the radial direction.

  The convex portion 56 formed on the surface of the leg portion 52 of the holding member 50 is a coil conductor 42 constituting the rotor coils 30n, 30s corresponding to the common coil among the rotor coils 28n, 28s, 30n, 30s arranged to face each other. (See FIG. 3) and projecting in the circumferential direction so as to be engageable. More specifically, in the present embodiment, these convex portions 56 can be engaged with the coil conductors 42 of the rotor coils 30 n and 30 s arranged radially inside the slot 34. As a result, part of the centrifugal force acting on the rotor coils 30 n and 30 s when the rotor rotates can be shared by the leg portion 52 of the holding member 50 by the coil conducting wire 42 engaging with the convex portion 56.

  Here, the surface shapes of the rotor coils 30 n and 30 s facing the leg portion 52 of the holding member 50 are formed in advance so as to be recessed at a portion corresponding to the convex portion 56 and protruding at a portion corresponding to the portion between the convex portions 56. By doing so, the convex portion 56 may be engaged with the coil conductor 42. Alternatively, the surface shape of the rotor coils 30n and 30s is formed flat in advance, and the holding member 50 is inserted between the two rotor salient poles 32n and 32s so that the convex portion 56 bites into the rotor coil 30n and 30s. The convex portion 56 may be engaged with the coil conductor 42.

  Further, in the present embodiment, an example is shown in which each convex portion 56 has a substantially semicircular cross section, but as will be described later, for example, it may be formed so as to protrude with another cross sectional shape such as a triangle. Good. Moreover, the arrangement | positioning space | interval and the number of arrangement | sequences in the radial direction of the convex part 56 can be suitably changed according to the thickness of the coil conducting wire 42 which comprises the rotor coils 30n and 30s, how to wind. For example, at least one convex portion 56 may be formed on the leg portion 52.

  Further, in FIG. 2, the coil conductors constituting the rotor coils 30 n and 30 s which are common coils are shown to have a larger diameter than the coil conductors constituting the rotor coils 28 n and 28 s constituting the induction coil. However, the present invention is not limited to this, and coil conductors having the same diameter may be used, or the coil conductors of the rotor coils 28n and 28s may have a relatively large diameter.

  A magnetic member 58 is embedded in the radially outer end portion 52 c of the leg portion 52 of the holding member 50. The magnetic member 58 is made of a metal plate such as a silicon steel plate, for example. Moreover, the magnetic member 58 is arrange | positioned correspondingly between the rotor coils 28n and 28s located adjacent to the circumferential direction. Further, the magnetic member 58 has a length that is the same as or substantially corresponding to the axial length of the rotor core 24. The function of the magnetic member 58 will be described later.

  As shown in FIG. 3, the circumferential tip 54a of the beam 54 of the holding member 50 has a tapered cross-sectional shape and is recessed in the circumferential direction at the radially outer end of the rotor salient pole 32n. It is fitted and locked in the locking recess 31. As a result, the beam portion 54 of the holding member 50 has its distal end portion 54a locked to the locking recess 31 so that the rotor coils 28n, 28s, 30n, and 30s are resisted against the centrifugal force when the rotor rotates. The holding force for holding can be effectively exhibited.

  Further, the locking state of the distal end portion 54a of the beam portion 54 that is restricted from moving radially outward to the locking recess portion 31 is the same as that of the end portion 52a of the leg portion 52 described above. 34 can be easily assembled by inserting the holding member 50 from the end in the axial direction.

  However, when the holding member 50 has a sufficient holding force that can prevent the rotor coils 28n, 28s, 30n, and 30s from popping out by the leg portion 52 and the beam portion 54 in the cantilever state, the holding member 50 The circumferential tip 54a of the beam 54 may not be locked to the ends of the rotor salient poles 32n and 32s.

  FIG. 4 is a schematic diagram showing how the magnetic flux generated by the induced current flowing in the rotor coil flows in the rotor in the rotating electrical machine of FIG. FIG. 5 is a view corresponding to FIG. 4, showing a diode connected to the rotor coil.

  As shown in FIGS. 4 and 5, two rotor salient poles 32n and 32s adjacent in the circumferential direction of the rotor 14 are taken as one set, and one end of a rotor coil 28n wound around the rotor salient pole 32n and the rotor salient pole 32s. Is connected to one end of a rotor coil 28 s wound around the first and second diodes 38 and 40, which are two rectifying elements. In the present embodiment, the connection circuit of the plurality of rotor coils 28n, 28s, 30n, 30s wound around the two rotor salient poles 32n, 32s adjacent in the circumferential direction of the rotor 14 is expressed as an equivalent circuit shown in FIG. Can do. As shown in this equivalent circuit, one end of each of the rotor coils 28n and 28s is connected at a connection point R via a first diode 38 and a second diode 40 whose forward directions are opposite to each other.

  Further, one end of the rotor coil 30n wound around the rotor salient pole 32n in each set is connected to one end of the rotor coil 30s wound around the rotor salient pole 32s. The rotor coils 30n and 30s are connected in series to form a common coil set 36. On the other hand, the other end of the rotor coil 30s is connected to the connection point R, and the other end of the rotor coil 30n is connected to each other end opposite to the connection point R of the rotor coils 28n and 28s via the connection point G. ing.

  Referring to FIG. 4 again, the stator 12 generates a rotating magnetic field by passing an alternating current through the stator coils 20u, 20v, and 20w. This rotating magnetic field is higher than the fundamental wave as well as the fundamental wave component. It contains a magnetic field of harmonic components of the order. More specifically, the distribution of magnetomotive force that generates a rotating magnetic field in the stator 12 is based on the arrangement of the stator coils 20u, 20v, and 20w of each phase and the shape of the stator core 16 by the teeth 18 and the slots 19, and only the fundamental wave. The sine wave distribution is not included and a harmonic component is included.

  In particular, in the concentrated winding, the stator coils 20u, 20v, 20w of the respective phases do not overlap each other, so that the amplitude level of the harmonic component generated in the magnetomotive force distribution of the stator 12 increases. For example, when the stator coils 20u, 20v, and 20w are three-phase concentrated windings, the amplitude level of the spatial secondary component that is a temporal tertiary component of the input electrical frequency is increased as a harmonic component. The harmonic components generated in the magnetomotive force due to the arrangement of the stator coils 20u, 20v, 20w and the shape of the stator core 16 are called spatial harmonics.

  When a rotating magnetic field including this space-emphasized wave acts on the rotor 14 from the stator 12, a fluctuation in leakage magnetic flux leaking into the space between the rotor salient poles 32 n and 32 s of the rotor 14 occurs due to a magnetic flux fluctuation in the spatial harmonics. Thereby, an induced electromotive force is generated in the rotor coils 28n and 28s. Rotor coils 28n and 28s near the stator 12 on the tip side of the rotor salient poles 32n and 32s generate an induced current by interlinking of the magnetic flux of the rotating magnetic field from the stator 12.

  The rotor coils 30n and 30s located on the base side of the rotor salient poles 32n and 32s and far from the stator 12 mainly have a function of magnetizing the rotor salient poles 32n and 32s. As understood from FIG. 6, the current flowing through the rotor coils 30n and 30s is the sum of the currents flowing through the rotor coils 28n and 28s wound around the adjacent rotor salient poles 32n and 32s.

  When an induced electromotive force is generated in each of the rotor coils 28n and 28s, an induced current corresponding to the rectification direction of the diodes 38 and 40 flows through the rotor coils 28n and 28s and the rotor coils 30n and 30s. Thereby, the rotor salient poles 32n and 32s around which the rotor coils 30n and 30s are wound are magnetized to function as magnets having a constant polarity. Further, the magnetization polarity is reversed between the rotor salient poles 32n and 32s adjacent in the circumferential direction by the winding direction of the rotor coils 28n, 28s, 30n, and 30s and the rectifying action of the diodes 38 and 40. In the illustrated example, an N pole is generated at the tip of the rotor salient pole 32n around which the rotor coils 28n and 30n are wound, and an S pole is generated at the tip of the rotor salient pole 32s around which the rotor coils 28s and 30s are wound. The That is, the N pole and the S pole are alternately arranged in the circumferential direction of the rotor 14.

  In such a rotating electrical machine 10, a rotating magnetic field formed on the teeth 18 acts on the rotor 14 by passing a three-phase alternating current through the three-phase stator coils 20 u, 20 v, 20 w. As a result, the rotor salient poles 32n and 32s are attracted to the rotating magnetic field of the teeth 18 so that the magnetic resistance between the rotor 14 and the rotor 14 is reduced, and torque (reluctance torque) acts on the rotor 14.

  In addition, as described above, the induction current generated by the linkage of the spatial harmonic magnetic flux included in the rotating magnetic field to the rotor coils 28n and 28s flows to the rotor coils 30n and 30s, so that the rotor salient poles 32n and 32s are in the circumferential direction. Are alternately magnetized to different polarities. At this time, the magnetic member 58 held by the holding member 50 is disposed between the adjacent rotor salient poles 32n and 32s. Therefore, for example, as indicated by broken line arrows α and β in FIG. 4, the magnetic member 58 makes it easy for magnetic flux of spatial harmonics from the stator 12 to be drawn to the rotor 14 side, and a large amount of magnetic flux is chained to the rotor coils 28n and 28s. Can be intermingled. As a result, a large induced current can be generated in each of the rotor coils 28n and 28s, and as a result, the magnetomotive force for each of the rotor salient poles 32n and 32s can be increased.

  Thus, the rotor salient poles 32n and 32s magnetized alternately in the N direction and the S pole in the circumferential direction interact with the rotating magnetic field by the stator 12 to generate attraction and repulsion. Also by this attraction and repulsion, torque (torque corresponding to magnet torque) can be applied to the rotor 14, and the rotor 14 is driven to rotate in synchronization with the rotating magnetic field generated by the stator 12. As described above, the rotating electrical machine 10 can function as a motor that generates power in the rotor 14 using the power supplied to the stator coils 20u, 20v, and 20w.

  In the above description, the case where the two diodes 38 and 40 are used for the two rotor salient poles 32n and 32s adjacent in the circumferential direction has been described. In this case, the number of diodes 38 and 40 that is ½ of the number of rotor salient poles 32n and 32s is required. However, only two diodes 38 and 40 can be used in the entire rotor 14. That is, all the rotor coils 28n are connected in series and treated as one N pole series connection induction coil, all the rotor coils 28s are connected in series and treated as one S pole series connection induction coil, The rotor coil 30n is connected in series and handled as one N pole series connection common coil, and all the rotor coils 30s are connected in series and handled as one S pole series connection common coil. In addition, using the connection relationship of FIG. 6, only two diodes 38 and 40 can be used.

  As described above, the rotor 14 of the rotating electrical machine of the present embodiment includes the magnetic member 58 disposed between the adjacent rotor salient poles 32n and 32s. For this reason, the spatial harmonics that are included in the rotating magnetic field generated by the stator 12 and interlink with the rotor coils 28 n and 28 s can be effectively increased by the magnetic member 58. As a result, the change in the magnetic flux density of the magnetic flux interlinking with the rotor coils 28n and 28s can be increased, the induced current induced in the rotor coils 28n and 28s can be increased, and the electromagnet formed on the rotor salient poles 32n and 32s. The magnetic force of the magnetic pole can be increased. As a result, the rotor magnetic force can be increased and the torque of the rotating electrical machine 10 can be improved.

  Further, a plurality of convex portions 56 are formed on the circumferential surface of the leg portion 52 of the holding member 50 provided in the rotor 14 so as to engage with the coil conductor 42 constituting the adjacent rotor coils 30n, 30s. Yes. As a result, the centrifugal force acting on the rotor coils 30n and 30s when the rotor rotates can be handled by the legs 52 of the holding member 50. Therefore, the leg portion 52 and the beam portion 54 of the holding member 50 can share and exert a holding force against the centrifugal force. As a result, compared with the case where the rotor coil 28n, 28s, 30n, 30s is held against the centrifugal force by the beam portion 54 alone, the thickness of the base portion of the leg portion 52 and the beam portion 54 can be reduced. Thus, a large coil winding space between the rotor salient poles 32n and 32s can be secured without being pressed.

  In more detail, as shown in FIG. 7, in the case of the holding member 51 in which the convex portion is not provided on the surface of the leg portion 52, the centrifugal force to the outer side in the radial direction acting on the rotor coil when the rotor rotates is It is mainly supported by the beam portion 54 of the holding member 51. Therefore, in order to stably hold the rotor coil in a state of being wound around the rotor salient pole against the centrifugal force, the curved surface constituting the base portion 53 of the beam portion 54 with respect to the leg portion 52 in the holding member 51. It is necessary to ensure the strength by forming a large radius of curvature and increasing the thickness of the base 53. As a result, the coil accommodating space in the slot 34, particularly the accommodating space for the rotor coils 28n and 28s wound around the leading ends of the rotor salient poles 32n and 32s, is pressed. As a result, measures such as reducing the wire diameter of the coil conductors constituting the rotor coils 28n and 28s or reducing the number of turns are required, which hinders efficient generation of induced current. .

  On the other hand, as in the present embodiment, a plurality of convex portions 56 that engage with the coil conductors 42 that constitute the rotor coils 30n and 30s are formed on the leg portions 52 of the holding member 50 so that the rotor coils 30n and 30s Since the acting centrifugal force is also shared by the leg portion 52, the rotor coil can be applied to the rotor salient poles 32n and 32s even if the thickness of the base portion 53 of the beam portion 54 is not increased so much. It is possible to stably hold the wound state. Therefore, the radius of curvature of the bay pole surface constituting the base portion 53 can be formed smaller, and a large accommodation space for the coil conductor 42 can be secured.

  In addition, since a part of the centrifugal force acting on the rotor coil can be handled by the leg portion 52 of the holding member 50 in this way, the centrifugal force of the rotor coil acting on the beam portion 54 of the holding member 50 is reduced. Can be reduced. As a result, it is possible to relieve stress generated in the locking recess 31 of the rotor salient poles 32n and 32s and the vicinity thereof where the tip 54a (see FIG. 3) of the beam portion 54 is locked, and as a result, the rotor salient pole. There is also an advantage that the occurrence of magnetic saturation at the radially outer ends of 32n and 32s can be suppressed.

  Here, when the stress distribution of the base portion 53 in the holding member 50 of the rotor 14 of the present embodiment is analyzed by the simulation model, the stress acting on the base portion 53 when the plurality of convex portions 56 are formed is the convex portion. It was confirmed that it was alleviated to about half of the case of none. Further, when the stress distribution in the vicinity of the locking recess 31 of the rotor salient poles 32n, 32s when such a protrusion 56 is provided is analyzed by a simulation model, this case is also about half of the case without the protrusion. We were able to confirm that it was alleviated.

  Next, with reference to FIGS. 8-10, the modification of the convex part 56 formed in the leg part 52 of the holding member 50 is demonstrated.

  The convex portions 56 formed on the leg portions 52 of the holding member 50 are not limited to those having a substantially semicircular cross section as in the above-described embodiment, and as shown in FIG. It may be formed as having a triangular cross section having an apex angle. In this case, as shown in FIG. 9, the radially inner inclined surface on which the centrifugal force of the rotor coils 28n, 28s, 30n, and 30s acts on the convex portion 56 is perpendicular to the radial direction. Assuming the angle θ to be formed, it is preferable to set 0 ° <θ <90 °. By forming in such an angle range, the centrifugal force of the rotor coils 30n, 30s acting in the direction of the arrow F with respect to the convex portion 56 can be effectively shared and handled by the leg portion 52 of the holding member 50. .

  Moreover, as shown in FIG. 10, the convex part 56 formed in the leg part 52 of the holding member 50 may be formed as having a triangular cross section having an acute apex angle. Also in this case, if the angle θ formed by the radially inner inclined surface with which the centrifugal force of the rotor coils 28n, 28s, 30n, and 30s acts on the convex portion 56 with respect to the line orthogonal to the radial direction is 0. It is preferable to set the angle <θ <90 °.

  The present invention is not limited to the above-described embodiments and modifications, and various improvements and modifications can be made within the matters described in the claims of the present application and their equivalent scope.

  For example, in the above description, the magnetic member 58 is embedded in the radially outer end of the leg portion 52 of the holding member 50. However, the present invention is not limited to this, and the magnetic member may be omitted. Also by this, it is possible to exert the same effect as in the case where a part of the centrifugal force acting on the rotor coils 28n, 28s, 30n, and 30s is received by the legs of the holding member.

  In the above description, the leg 52 of the holding member 50 has been described as having a plurality of convex portions 56 formed on the surface facing the rotor coils 30n and 30s corresponding to the common coil. However, the present invention is not limited to this. is not. For example, convex portions may be formed on the surfaces of the holding member legs that face the rotor coils 28n and 28s corresponding to the induction coils, or the holding member legs face the rotor coils 28n and 28s. You may form a convex part only in the surface.

  In this case, resin or the like is filled between the rotor coil of at least one of the common coil and the induction coil and the leg portion of the holding member, and the engaged state or the fixed state of the convex portion and the rotor coil is set via this filler. It may be more reliable. Thereby, it becomes possible to take part of the centrifugal force acting on the rotor coil even in the leg portion other than the convex portion, and the holding force of the rotor coil by the holding member can be further enhanced.

  Further, in the above description, the rotor coil is described as being divided into a common coil and an induction coil. However, the present invention is applicable to any rotor for a rotating electrical machine having a rotor coil wound around a rotor salient pole of a rotor core. May be.

  10 Rotating machine, 12 Stator, 14 Rotor, 16 Stator core, 18 Teeth, 19, 34 Slot, 20u, 20v, 20w Stator coil, 24 Rotor core, 26 Shaft hole, 27 Locking groove, 28n, 28s, 30n, 30s Rotor coil , 31 Locking recess, 32n, 32s Rotor salient pole, 34a Rotor yoke, 35 insulator, 36 Common coil set, 38 1st diode, 40 2nd diode, 42 Coil conductor, 50 Holding member, 52 Leg part, 52a, 52c End Part, 52b slot inner part, 53 root part, 54 beam part, 54a circumferential direction front end part, 56 convex part, 58 magnetic member.

Claims (5)

A rotor core having a plurality of rotor salient poles arranged along the circumferential direction of the outer periphery;
A rotor coil wound around the rotor salient pole;
A holding member provided to close a slot between the rotor salient poles,
The holding member includes a leg portion extending in a radial direction between rotor coils wound around two rotor salient poles adjacent in the circumferential direction, and a radially inner end portion fixed to the rotor core; and the leg portion A beam part extending from the radially outer end of each of the circumferentially opposite sides to close the radially outer side of the slot, and
Leg of the holding member does not include the coolant passage and the convex portion in contact with the coil lead constituting the rotor coil is formed to protrude in the circumferential direction, the rotor of the rotary electric machine. The rotor of the rotating electrical machine according to claim 1,
The rotor of the rotating electrical machine includes a plurality of convex portions of the holding member formed on both circumferential surfaces of the leg portion at a radial interval. In the rotor of the rotating electrical machine according to claim 1 or 2,
A rotor of a rotating electrical machine, wherein a circumferential tip portion of a beam portion of the holding member is locked to an outer peripheral end portion of the rotor salient pole. In the rotor of the rotating electrical machine according to any one of claims 1 to 3,
The rotor coil is wound around the tip of each rotor salient pole so that an induction current is generated by interlinking of the magnetic flux of the rotating magnetic field generated by the stator, and the induction coil connected to the induction coil A rectification unit that rectifies the direction of current flow, and is wound around the base side of each rotor salient pole and connected to the induction coil, and the rotor salient poles are circumferentially driven by the induced current generated in the induction coil A rotor of a rotating electrical machine comprising a common coil that is alternately magnetized to different polarities. The rotor of the rotating electrical machine according to claim 4,
A rotor of a rotating electrical machine, wherein a magnetic member is provided on a leg portion of the holding member positioned between induction coils on both sides in the circumferential direction in the slot.

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